Thermostatic alarm



Sept. 2.9, 1931. F. .1. scHoLTz THERMOSTATIC ALARM Filed Aug. 2v. 1929 2Sheets-Sheet 1 atroz nu* Sept. 29, 1931. F. .1. scHoL-rz 1,824,933

THERMOSTATIC ALARM Filed Aug. 27, 1929 2 Sheets-sheet 2 ,I m ,m .MQ F\N\ m Z/ u ...A -A.. rl@ H f/ o l u mi W KN A N I6. si m\ QQ Wwf. M\\ FQN In wil Patented Sept. 29, 1931 FERDINAND J'. SCHOLTZ, 0F WATRTOWN,SOUTH DAKOTA THERMOSTATIC ALARM Application led August 27, 1829. SerialNo. 388,791.

This invention relates to thermostatically actuated devices for soundingan alarm or giving a signal of any other character in case thetemperature of aparticular object or at a particular point, rises aboveor sinks below a certain degree and the general object of the inventionis to provide a simple, readily ad-Y justed device of this characterwhich will not befliable to get out of order and which will indicate themaximum or minimum temperature to which the alarm has been set. Afurther object is to 'provide a device of this character which is verysimply constructed and which includes a tem erature controlled handmovable across a ial and two contacts movable in the direction ofmovement of the hand to bring them nearer to or further from the hand,these ycontacts beingwithin thel casing enclosing the ther- 2J mostatand moving over graduations which are-corelated with the fthermometricgraduations on the dial.

Other 'objects are to eliminate the possibility of the indicator or handbecoming loose on its stud or shaft and the Vcorrosion or rusting or thecollection of dust around said shaft or to eliminate the possibility ofthe adjusting nut becoming loose, ythus causing inaccuracy in adjustingthe temperature.

Another object is to provide pivoted contacts disposed in the path ofmovement'of the indicator hand, these contacts being connected incircuit with the alarm by wires leading from the pivot points of thecontacts, thus preventing any possibility of the wires becoming brokenthrough more or less constant adjustment.

Another object is to provide a construc- 19 tion which eliminates thenecessity of removing any part of the cover or casing of the dej vice inorder to adjust the contacts.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure1 is a front elevation `of a thermo.

static alarm constructed in accordance with my invention and shown 1nuse w1th a transformer and a signal;

Figure 2 is a side elevation of the thermostatic alarm;

Figure 3 is a face view of the alarm with the outer cover removed;

Figure 4 is a section on the line 4 4 of 5: Figure 3;

Figure 5 is a detailed view of the connectin member 22. j

eferring to the drawings, 10 designates the'peripheral casing oftemperature con- G0 trolled element constituting in eilect athermometer, this casing being formed with an outer face 11 having aslot 12 through which thegraduations 13 on a dial back of the outer facemay be read, these graduae( tions being shown as Fahrenheit graduations.f

Thecasing is preferably formed in two sections, the back section beingdesignated 14. The peripheral walls of these two sections are formedwith slots 15 for purposes to be later stated.

Riveted or otherwise attached to the back `Wall 14 of the casing is aplate 17 of fibre or other insulating composition having a centralopening. Extending through this opening is the shank of a rivet 18, thisrivet having a fiange 19 so that this ibre plate 17 is embraced betweenthe ange'and the head of the rivet. The rivet has attached to it thecoiled portion 8o 20 of a temperature controlled or thermo-operatedelement 21 constituting a hand or y pointer which moves over thegraduations 13 and which is observable through the glass pane disposedwithin the slot or opening 12. This thermometric element is formed of aleaf spring and the expansion and contraction of this temperaturecontrolled element operates to shift the hand from one end of the scaleor graduations 13 to the other end there- 90 of. The rivet is. tubularand having engagement with this tubular rivet by a screw is a lug 22projecting radially outward and connected by a wire 23 to a binding post24 in the peripheral Wall of the casing. Disposed through the peripheralwall of the casing, which casing is of metal, is a binding post 25.Pivotally mounted by means of rivets 26 to the back 'section 14 aremetallic arms 27, these arms being alike, the outer ends of the 10o armsextendingjoutward through the slots 15, While the inner ends 'of thearms form contacts 28 disposed in the path of movement of the spring 21.These arms may have frictional contact with the Walls of the slots or beotherwise formed sothat the arms can be shifted in one direction or theother and Will hold rmly in their shifted positions.

The front of the casing is provided on each side ofthe middle with agraduated scale 29 graduated in degrees and correlated with theraduations 13, these contact arms being adgustable in yaccordance withthese scales 29.

' For instance when va contact arm is moved so that it is opposite thegraduations indieating ten degrees on the scale 29, the arm vvill haveits Contact 28 shifted-over to a point signature.

FERDINAND J. SCI-IOLTZ.

tion of the case,

where a rise of ten degrees in temperature l I will cause the springpointer 21 to contact with the arm and sound the signal or the arm mightbe shifted to a point Where it may require a movement of the springointer 21 to 110 degrees on scale 13 before t is change is made.

As shown in Figure 1, the binding post 24 is connected by a conductor 30to a signal 31 and thence to a source of current While the binding post25 is connected by a conductor 32 to the source of current. These Wiresmay pass through a transformer ifQ for instance, one hundred .and tenvolt A. (.1. current is to be used in this signal circuit or the currentmay be secured from a battery, in which case, of course, no transformeris necessary.

Obviously minor details might be changed without departing from thespirit of the invention, but I regard the particular mounting of thespring pointer 21 as being of importance.

It will be noted that the arms' 27 are each grounded by the rivet 26which grounds this arm to the metallic casing, thus forming a connectionto the return wire connected to -bindmg post 25. It will thus be seenthat movement of either one of these arms 27 will not in any Way affectany wiring and will not tend to break or bend any Wires. By this meansalso, I practically do away with all interior wiring except the Wire 23which does not move and is, therefore, not liable to become detached orbreak.

I claim In a thermostatic alarm of the character described, a casinghaving a metallic section,

an insulating base mounted upon the metallic section, a rivet passingthrough said insulating base, a thermometric element in the form of aspring having one end coiled and engaged with said rivet, the other endformed to provide'a pointer, the case having a graduated scale overwhich the pointer moves, a lug carried by the rivet, binding postmounted upon the casing and insulated therefrom to which said lugisxelectrically. connected and contact arms each pivoted to* a metallicpor-

